The diplomatic fallout has begun with former Indonesian president Susilo Bambang Yudhoyono cancelling a three-day trip to Perth.

He was scheduled to speak at the In the Zone Asian leadership forum at the University of Western Australia on Friday.

"It still doesn't have to be this way," a tearful Chinthu, Sukumaran's brother, said.

Chan's brother Michael said Indonesian President Joko Widodo was the only person who could save their lives now.

Earlier this year, the Revered Buckingham told Fairfax Media that the day the Bali nine were arrested in Denpasar in 2005 with 8.3 kilograms of heroin, she wrote in her prayer diary: "How dumb can you get and still breathe? Nevertheless Lord, show your mercy."

Little did she know that a decade later she would be asked to provide spiritual guidance to Sukumaran in his last hours.

For more than three years, Mrs Buckingham and her husband Rob regularly travelled to Bali's Kerobokan prison to visit the men and tirelessly campaigned for their lives to be saved.

"We've never actually seen people so totally reformed," she told Fairfax in January. "They're like us now. They weren't. They are now.

"If you knew them, you would not execute them. I can't even bear the thought."

As unbearable as the thought is, if the Indonesian authorities give their permission, she will be there for Sukumaran for his final moments on earth.

On Monday afternoon, the men's Indonesian lawyer, Professor Todung Mulya Lubis, said they were enjoying spending time with their families, sharing food and stories.

"They are still very optimistic, upbeat and cheerful," he said after a visit on Nusakambangan.

Another of Sukumaran's paintings was brought back from Besi prison on Monday.

Sukumaran told Professor Mulya he was painting his feelings. He said he was also aware of the others in a similar situation to him on death row.